Added sample Dockerfile

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:12
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Install app dependencies
+# A wildcard is used to ensure both package.json AND package-lock.json are copied
+# where available (npm@5+)
+COPY package*.json ./
+
+RUN npm install
+# RUN npm ci --only=production
+
+COPY . .
+
+EXPOSE 3000 3001
+
+CMD ["npm", "start"]